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@ARTICLE{Nemkovski:311922,
      author       = {Nemkovski, K. S. and Kozlenko, Denis and Alekseev, P. A.
                      and Mignot, J.-M. and Menushenkov, Alexey and Yaroslavtsev,
                      A. A. and Clementyev, E. S. and Ivanov, A. S. and Rols, S.
                      and Klobes, B. and Hermann, Raphael and Gribanov, A. V.},
      title        = {{E}uropium mixed-valence, long-range magnetic order, and
                      dynamic magnetic response in
                      $\mathrm{{E}u{C}u_{2}({S}i_{x}{G}e_{1−x})}$$\mathrm{_{2}}$},
      journal      = {Physical review / B},
      volume       = {94},
      number       = {19},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2016-05229},
      pages        = {195101},
      year         = {2016},
      abstract     = {In mixed-valence or heavy-fermion systems, the
                      hybridization between local f orbitals and conduction band
                      states can cause the suppression of long-range magnetic
                      order, which competes with strong spin fluctuations. Ce- and
                      Yb-based systems have been found to exhibit fascinating
                      physical properties (heavy-fermion superconductivity,
                      non-Fermi-liquid states, etc.) when tuned to the vicinity of
                      magnetic quantum critical points by use of various external
                      control parameters (temperature, magnetic field, chemical
                      composition). Recently, similar effects (mixed-valence,
                      Kondo fluctuations, heavy Fermi liquid) have been reported
                      to exist in some Eu-based compounds. Unlike Ce (Yb), Eu has
                      a multiple electron (hole) occupancy of its $4f$ shell, and
                      the magnetic Eu$^{2+}$ state $(4f^{7})$ has no orbital
                      component in the usual $LS$ coupling scheme, which can lead
                      to a quite different and interesting physics. In the
                      EuCu$_2$(Si$_x$Ge$_{1−x}$)$_2$ series, where the valence
                      can be tuned by varying the Si/Ge ratio, it has been
                      reported that a significant valence fluctuation can exist
                      even in the magnetic order regime. This paper presents a
                      detailed study of the latter material using different
                      microscopic probes (XANES, Mössbauer spectroscopy, elastic
                      and inelastic neutron scattering), in which the composition
                      dependence of the magnetic order and dynamics across the
                      series is traced back to the change in the Eu valence state.
                      In particular, the results support the persistence of
                      valence fluctuations into the antiferromagnetic state over a
                      sizable composition range below the critical Si
                      concentration xc ≈ 0.65. The sequence of magnetic ground
                      states in the series is shown to reflect the evolution of
                      the magnetic spectral response.},
      cin          = {Eur.XFEL / DOOR},
      ddc          = {530},
      cid          = {$I:(DE-H253)Eur_XFEL-20120731$ /
                      I:(DE-H253)HAS-User-20120731},
      pnm          = {6G13 - XFEL (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G13},
      experiment   = {EXP:(DE-H253)D-A1-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000386617700001},
      doi          = {10.1103/PhysRevB.94.195101},
      url          = {https://bib-pubdb1.desy.de/record/311922},
}